Island



(No Model.)

F. SPALDING.. MIGROMBTBR DEPTH GAGE.

No. 597,335. Patented Ja,11.l1,l898.

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UNITED STATESl FRANK SPALDING, OF PROVIDENCE,

PATENT OFFICE.

.Rl-IODE ISLAND, ASSIGNOR TO THE MICROMETER DEPTH-GAG E.

l SPECIFICATION forming part of Letters Patent No. 597,335, dated January 11, 1898.

Application led Merch 29, 189'7 .To @ZZ whom it may concern,.-

Be it known that I, FRANK SPALDING, of Providence, in the county of ,Providence and State of Rhode Island, have invented a new and useful Improvement in yMicrometer- Gages; and I hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanyin g drawings, formin g part of this specifica-tion.

This invention has reference to an improvement in micrometer-gages adapted for measuring accurately the depth of a hole, the length or the width'of an article, or the distance from one edge to a given point by a micrometer-scale.

The invention consists in the peculiar and novel construction of the gage by means of which the measuring is facilitated, as. will be more fully set forth hereinafter. y

Figure 1 is a side view of the micrometergage. Fig. 2 is a transverse sectional view of the same on an enlarged scale. Fig. 3 is a sectional view of the tubular micrometerspindle, showing the same provided with a clamping end. Fig. 4 is an' end view of the clamping end of the tubular spindle shown in Fig. 3 on a magnified scale, and Fig. 5 isa sectional view of the clamping end of the tubular micrometer-spindle. Y

Similar numerals of reference indicate corresponding parts in all the iigures.

In the drawings, 6 indicates the base, which is provided with an internallyscrew-threaded socket to receive one end of the barrel 7, and also perforated to permit of the passage of the rod S. The lock-nut 9, peripherically milled or roughened, engages with the screwthread 10 on the barrel 7. The cylindrical portion of the barrel 7 is provided with the scale 11. The upper end of the barrel '7 is internally screw-threaded and has the tapering end 12, which'is divided by four longitudinal slits into fingers externally screwthreaded. The tubular micrometer-spindle 13 engages with the internal screw-thread of the barrel 7, and the screw-threaded clamping-ring 14 is used to regulate the friction between the internal screw-thread on the barrel 7 and the screw-thread on the tubular spindie 18, so as to prevent backlash. Thein- Serial No. 629,727.l (No model.)

dicator-sleevel, beveled at its lower edge, is provided with a peripheral scale at its lower end. The peripheral surface of the main portion is milled or roughened. The upper end 16 of the tubular spindle 13 is divided longitudinally by four slits, as shown in Fig. 4, and the upper end is provided with the annular rectangular clips 17, which engage with the rectangular grooves 18, placed at predetermined distances apart on the rod 8. The clamp 19, internally7 screwthreaded, engages with the screw-thread 2O on the tubular spindle 13, and the Yconical end 21 clamps the rectangular clips 17 into the'groove 18 and thereby secures the rod 8 at predetermined intervals. The clamppiece 19 has part of its outer surface milled or roughened tofacilitatethe turning of the same. Y v

Having described the parts,I will now more fully describe the operation of the same.

The gage is designed for use in measuring by micrometer measurement the depth of holes, grooves, or recessed parts, the distance from the ends, the sides, or from a shoulder to any desiredpoint, and for other purposes n for which it may prove adapted.

One object of the invention is'to facilitate the measuring of varying depths or distances by a micrometer-gage.

Another object of the invention is to provide for accurate adjustment of the gage and for readj ustment of the parts necessitatedby the wear of the parts, and to these ends I provide -the rod 8 with a series of annular V- shaped grooves, the two inclined surfaces of which grooves are made preferably at right angles to each other. The sides of these grooves may be at an angle of less than ninety degreesto each other, but when of a greater angle than the right angle the adjustment is not as reliable as is required in a gage designed to measure micrometrically. The annular groove 18', which is the lowest shown in Fig. 2, may be termed the standard groove, for when the clips 17 are engaged in this groove 18 and held in this groove by the clamp 19 the lower end of the rod 8 must be exactly even with the extended surface 6 of the base 6, the lower end of the beveled annular edge of the sleeve 15 must be at 0,V

IOO

- the zero-line of the scale 11,fand the Ol or zero-line on lthebeveled end of the sleeve 15 must be on the verticalline of the scale 1.1, asis indicated in Fig. 1. If when adjusted to zero the lower end of the rody 8 is not eX- actly on a line with the bearing-surface 6 of' the base. 6,the lock-nut 9 is released and the base 6 is turned on the screw-thread 10 until the surface 6 of the base 6 is exactly on aline-with the end of the rod 8. When the scales are at the zero-mark, the lock-nut 9 is then turned irmly against the base 6 to secure the saine in the adjusted position. Any

.wear on the face 6 of the ybase 6 or of theend of ythe rod S will not affect the accuracy of the gage,\vhich isadj usted from time to time, as above described.. f

. The distances between the annularl grooves 18 18 are equal to the length of thescale y11.

These distances may be of any desired stand- As indicated in Fig. 1 they arey ard length. one-half of an inch. 1 As indicatedl in `Fig. 2

f theyl are one inch.l .They may be any predeitermined f distance, ypreierably of a lunit or yturning theclamp 19 so as .to release the clips 17 from the groove. the rod 8 may be projected.y

fraction of a unit, of a standard scale.

one, two,y three, or more lengths of thestandard distance 'froml the face 6. The clips 17 rare -now secured in one of the grooves 18 by the clamp 19, and the additional micrometery rmeasurement is made by turning lthe sleeve 15 and reading the distance on the micrometer-scale.

By this construction the gage is equally well adapted for measuring fractions. offan inch and distances of two, three, or more linches and fractions of inches bymicrometric place by the spring-clamp, andi's adjusted for micrometric measurement by turningl the f graduated sleeve, as described. f f

2. In a. micrometer depth-gage, the combi-y 'nationy with the graduatedr and Vrinternallyscrewfthreaded barrel, the tubular screw-y threaded spindle, a clamp on the upper end of lthe tubular screw-threaded spindle, a graduated sleeve secured tothe tubularscrew-l f threaded spindle, and arod extending through the tubular screw-threaded spindle andy secured by the clamp, of the rbase 6, secured to f y the internally screw threaded barrel by screw'- thread engagement and the nut 9, f f whereby the base may be adjusted to com penf sate for wear, as described. l

; 3. In a micrometer depthfgage, the combination of the following instrumentalities: al

barrel,` internally screwthreaded, for lthe leading; screw or spindle, a tubular leading screw or spindle, a graduated sleeve secured f to the spindle7 a base secured to the endl of the barrel opposite lto the end in which .the

spindle is secured, a rod divided part of itsf length by annular grooves into predetermined lengths, said rod extending through the tub ular spindle and through 'they base, spring-clips adapted to enter the annular grooves on the rod, and a clamp, acting on.' the spring-clips, wherebythe rod may be proj ecteda predetermined distance beyond lthehase and then micrornetricallyy adjusted to secure the accurate L measurement, as described. l f

4'. In a micrometer depth-gage,.the combination with the barrel 7, the tubular spindle 13, the sleeve 15r secured to the spindle, the

base 6 secured by screw-thread engagement to the lbarrel 7, andthe nut 9, of the springclips 17 forming part of the upper end of the spindle 13, the clamp 19 for controlling the spring-clips 17, and the rod 8 subdivided part of its length by the grooves 18 18 and extending through the base 6 and through the tubular spindle 13, as and for the purpose substantially as described.

In witness whereof I have hereunto set my hand. f

FRANK SPALDING.

Vitnesses:

M. F. BLIGH, JOSEPH A. MILLER, Jr. 

